PHYSICS P1 2022

Suggest 2 reasons why wind power is unable to meet the demand for electricity in the UK (2)

any 2 from:

• wind is unreliable

• wind turbines don’t turn when the wind is too strong/weak

• there are not enough wind turbines

• efficiency would increase

• because the proportion of usefully transferred energy would increase

• because less work is done against friction

In most homes in the UK there are many different electrical devices.

Explain why people should be encouraged to use energy efficient electrical devices (2)

• more efficient devices waste less energy

• which would minimise the electricity/energy demand

or

which would minimise the environmental impact from electricity generation

Explain why the reading on the balance increases (3)

• there is an additional force on the balance

• because the rod is negatively charge

• and like charges repel

Explain how the risk from internal contamination is different to the risk from external irradiation by a source of alpha radiation.

Some thermal energy was transferred to the surroundings while the water was being heated.

Explain how this affected the student’s value for the specific latent heat of vaporisation of water. (2)

• less energy was transferred to the water

• so the student’s value was too high

The total power output of the girl was greater than expected

Suggest two reasons why (2)